What Is It Wednesday, Week 8

Each member gets one guess. The answer will be revealed on the following Tuesday. The first correct guess has the honour of submitting the image for the next challenge. Sometimes there will be more than one thing in the photo or more than one way to accurately describe what the photo represents. The original poster will be the final judge of who is "most correct".

those metal parts look like they mean business. I haven't a clue. I'll go with the very vague something to do with waging war. And if pressed for more detail I'll shrug my shoulders and mutter "part of a catapult"?